>That's a non-normative note encouraging implementations to optimize resource consumptions here granted they meet spec requirements.
RFC 2119 terms must not be used in non-normative sections, and such sections must be clearly marked as non-normative as noted in https://w3c.github.io/sensors/#conventions:
>All of the text of this specification is normative except sections explicitly marked as non-normative, examples, and notes. [RFC2119]
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